JP2016001973A - Switched reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switched reluctance (SR) motor capable of reducing vibration noise due to wind noise.SOLUTION: An SR motor 1 comprises: a rotor 3 formed with a plurality of salient poles 31; and a stator 2 disjunctively disposed at an outer periphery of the rotor 3 on the same axis as that of the rotor 3. The SR motor 1 further comprises: insertion members 4 inserted into groove portions 32 among the salient poles 31; and side plates 5 being disposed at both end portions in an axial direction of the rotor 3 in a state of the insertion members 4 inserted into the groove portions 32 on the same axis as that of the rotor 3 and having diameters greater than an inner diameter of the stator 2. Engaging protrusion portions 41 protruding closer to outsides in the axial direction than end surfaces of the rotor 3 in the axial direction are formed at both the end portions of the insertion members 4 in the axial direction. Engaging recess portions 51 engaging with the engaging protrusion portions 41 are formed on surface portions 5a of the side plates 5 facing the rotor 3. The insertion members 4 are latched with the side plates 5 by engaging the engaging protrusion portions 41 with the engaging recess portions 51.

Description

  The present invention relates to a switched reluctance motor.

  As the electric power source of the vehicle is being electrified, a magnet field type (PM Permanent Magnet) motor or a switched reluctance (SR Switched Reluctance) motor is known as an electric motor that is a power source. The PM motor has a high cost of magnet raw materials and may be unstable in supply due to natural resources with limited mining sites. Therefore, the demand for SR motors that do not use magnets is increasing. The SR motor is composed only of an iron core having ferromagnetism, and can obtain the same efficiency and output as the PM motor.

  In order to reduce the air resistance at the salient poles of the rotor, the motor described in Patent Document 1 discloses that the groove between the salient poles is filled with a non-magnetic material so that the outer peripheral surface of the rotor has a smooth curved surface. Has been.

JP-A-11-113223

  Thus, the SR motor has a problem that vibration noise due to wind noise is large.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an SR motor capable of reducing vibration noise caused by wind noise.

  The present invention is a switched reluctance motor comprising a rotor in which a plurality of salient poles are formed, and a stator that is coaxial with the rotor and disposed in contact with the outer periphery of the rotor. An insertion member to be inserted into the groove portion, and in a state where the insertion member is inserted into the groove portion, on both end portions in the axial direction of the rotor, the side plate is disposed coaxially with the rotor and has a diameter larger than the stator inner diameter. And engaging projections that protrude outward in the axial direction from the end surface in the axial direction of the rotor are formed at both ends in the axial direction of the insertion member, and face the rotor of the side plate. An engagement recess that engages with the engagement protrusion is formed on the surface portion, and the insertion member is locked to the side plate by engaging the engagement protrusion with the engagement recess. It is characterized by.

  In the SR motor according to the present invention, in the state where the insertion member is inserted into the groove between the salient poles, the side plates disposed coaxially with the rotor at both ends in the axial direction of the rotor have a diameter larger than the stator inner diameter, It arrange | positions so that the gap between a stator and a rotor may be covered. For this reason, since it can suppress that air flows in into the gap between a stator and a rotor, or air is discharged | emitted from a gap, there exists an effect that the vibration noise by a wind noise can be reduced. Further, the insertion member inserted into the groove between the salient poles is locked by engaging the engaging convex portion with the engaging concave portion of the side plate. For this reason, since it is not necessary to change the shape of the salient pole in order to fix the insertion member, processing is easy, and the generated torque does not decrease due to the reduction in the sectional area of the salient pole.

FIG. 1 is a cross-sectional view showing an SR motor according to an embodiment. FIG. 2 is a side view showing the SR motor and the insertion member. FIG. 3 is a perspective view showing a rotor, an insertion member, and a side plate of the SR motor. FIG. 4 is a perspective view showing an insertion member of the SR motor. FIG. 5 is a cross-sectional view showing the rotor, insertion member, and side plate of the SR motor.

  Embodiments of an SR motor according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

  FIG. 1 is a sectional view showing an SR motor (switched reluctance motor) 1 according to an embodiment of the present invention. The SR motor 1 according to the present invention is fixed in a casing 10 by a fastening member 12 including a bolt via a bracket 11. The SR motor 1 mainly includes a stator 2, a rotor 3, an insertion member 4, and a side plate 5.

  The stator 2 is coaxial with the rotor 3 and is disposed so as to be in contact with the outer periphery of the rotor 3. A plurality of salient poles (not shown) are formed at equal intervals on the inner peripheral surface of the stator 2. A coil is wound around each salient pole, and a magnetic field around the axis is formed in the space inside the stator 2 by energizing the coil. More specifically, by switching the energized coils in a predetermined order, the attraction force generated between the salient poles of the stator 2 and the salient poles 31 of the rotor 3 (see FIG. 2 etc.) is changed to rotate the rotor 3. Let Such a stator 2 is press-fitted into the bracket 11 and fixed. The bracket 11 is fixed in the casing 10 by a fastening member 12 including a bolt.

  The rotor 3 is attached to a substantially central portion of a shaft 30 that is rotatably attached to the casing 10 and is in contact with the stator 2 on the inner peripheral side of the stator 2 so as to be rotatable around an axis. It is accommodated in a state where it is not, that is, in a state having a gap G. The rotor 3 rotates around the axis by a magnetic field formed by energizing a coil wound around the salient pole of the stator 2. Further, as shown in FIG. 2, a plurality of salient poles 31 are formed at equal intervals on the outer peripheral surface of the rotor 3. Here, twelve salient poles 31 are formed.

  As shown in FIGS. 2 and 3, the salient pole 31 extends on the outer peripheral surface of the rotor 3 along the axial direction to both ends in the axial direction. As shown in FIG. 2, a groove 32 is formed between the salient poles 31 adjacent to each other. The groove portion 32 is formed on the outer peripheral surface of the rotor 3 along the axial direction up to both end portions in the axial direction. Here, twelve groove portions 32 are formed. The width of the groove 32 is wide on the outer peripheral side and narrower on the inner peripheral side. Due to the salient poles 31 and the groove portions 32, the outer peripheral surface of the rotor 3 has a shape in which irregularities are repeated in the circumferential direction.

  As shown in FIG. 2, the insertion member 4 is formed of a nonmagnetic material having a shape and size that can be engaged with the groove 32 of the rotor 3. As the insertion member 4, a lightweight and highly rigid material, for example, CFRP (Carbon Fiber Reinforced Plastics) is suitable. As shown in FIG. 5, the axial length d1 of the insertion member 4 is the same as the axial direction of the rotor 3, and the height of the insertion member 4 is the same depth as the groove 32 as shown in FIG. Is formed. At both ends in the axial direction of the insertion member 4, as shown in FIG. 4, engaging convex portions 41 are formed that protrude outward in the axial direction by a length d 2 from the end surface in the axial direction of the rotor 3. . As shown in FIG. 2 and FIG. 3, when the insertion member 4 is inserted into the groove portion 32, the outer circumferential surface of the rotor 3 has no irregularities and becomes a smooth substantially cylindrical shape, and from both ends in the axial direction of the rotor 3. The engaging convex part 41 (refer FIG. 4) protrudes. Further, by engaging the engagement convex portion 41 of the insertion member 4 inserted into the groove portion 32 with the engagement concave portion 51 of the side plate 5 described later, the insertion member 4 is axially opposed to both ends (sides) by the side plate 5. Therefore, it is prevented that the rotor 3 is separated from the groove portion 32 by the centrifugal force when the rotor 3 is rotated.

  The side plate 5 has a diameter larger than the distance between the center of the shaft 30 (see FIG. 1) and the apex of the salient pole 31 of the rotor 3, as shown in FIG. 2 is a disk having a diameter larger than the inner diameter of 2 (see FIG. 3). As shown in FIG. 3, the side plate 5 protrudes radially outward from the apex of the salient pole 31 of the rotor 3 and the apex of the insertion member 4 inserted into the groove 32 (h1 shown in FIG. 5). Specifically, for example, it protrudes about 0.5 to 0.8 mm. As shown in FIG. 5, an engagement recess 51 that engages with the engagement protrusion 41 of the insertion member 4 is formed on the surface portion 5 a of the side plate 5 that faces the rotor 3. The engagement recess 51 is formed in a position, shape, and size that can be engaged with the engagement protrusion 41 of the insertion member 4 inserted into the groove 32 (see FIG. 2).

  As shown in FIG. 2, the side plate 5 has both end portions in the axial direction of the rotor 3 as shown in FIGS. 1, 3, and 5, with the insertion member 4 inserted into the groove 32 of the rotor 3. Are arranged coaxially with the rotor 3. As shown in FIG. 3, the side plate 5 arranged in this way closes both end portions of the rotor 3 and the insertion member 4 in the axial direction except for a penetrating portion of the shaft 30 (see FIG. 1). Further, as shown in FIG. 1, the side plate 5 is disposed on the side of the gap G between the stator 2 and the rotor 3, so that the inflow of air from the side to the gap G or the side from the gap G Regulates the discharge of air to the direction.

  Here, a method for assembling the rotor 3, the insertion member 4, and the side plate 5 will be described. First, as shown in FIG. 2, the insertion member 4 is inserted into the groove portion 32 of the rotor 3 from the outer peripheral side of the rotor 3. Thus, since all the groove parts 32 are filled with the insertion member 4, the outer peripheral surface of the rotor 3 does not have unevenness, and becomes a smooth substantially cylindrical shape. At this time, the engaging convex portion 41 protrudes from both end portions in the axial direction of the rotor 3. And as shown in FIG. 5, the side plate 5 is arrange | positioned at the both ends in the axial direction of the rotor 3 so that the engagement recessed part 51 of the side plate 5 and the engagement convex part 41 of the insertion member 4 may engage. . Thus, both end portions in the axial direction of the rotor 3 and the insertion member 4 inserted into the groove portion 32 are closed by the side plate 5. Further, since the insertion member 4 is supported from the side by the side plate 5, it is prevented from being peeled off from the groove portion 32 by centrifugal force when the rotor 3 rotates.

  The SR motor 1 according to this embodiment is configured as described above, and the operation thereof will be described below. When the coil wound around the salient pole of the stator 2 is energized, a magnetic field around the axis is formed, and the rotor 3 rotates around the axis.

  As shown in FIG. 1, the groove portion 32 (see FIG. 2) of the rotor 3 is filled with the insertion member 4, and both end portions in the axial direction of the rotor 3 and the insertion member 4 are side plates having a larger diameter than the inner diameter of the stator 2. 5 is occluded. For this reason, the inflow of air into the gap G between the stator 2 and the rotor 3 and the discharge of air from the gap G are restricted, and wind noise is suppressed. That is, since the air flow is restricted by the side plate 5, the air between the stator 2 and the rotor 3 rotates around the axis together with the rotor 3, thereby reducing wind noise.

  Moreover, the air discharged outward from the gap G is guided by the side plate 5 disposed on the side of the gap G so as to flow outward in the radial direction of the rotor 3. Thereby, since air is discharged toward the coil wound around the salient pole of the stator 2, the coil is cooled.

  In the SR motor 1 described above, the side plates 5 disposed at both ends in the axial direction of the rotor 3 with the insertion member 4 inserted into the groove portion 32 of the rotor 3 have a diameter larger than the inner diameter of the stator 2. 2 and the rotor 3 are disposed so as to close the side of the gap G. For this reason, since the inflow of the air to the gap G between the stator 2 and the rotor 3 and the discharge | emission of the air from the gap G can be controlled, a wind noise can be reduced. Here, specifically, according to the SR motor 1 having such a configuration, the wind noise is reduced by about 10 db.

  Further, the insertion member 4 inserted into the groove 32 of the rotor 3 is supported and locked from the side by engaging the engagement convex portion 41 with the engagement concave portion 51 of the side plate 5. Thus, since the insertion member 4 is supported from the side by the side plate 5, it can prevent peeling from the groove part 32 by centrifugal force even when the rotor 3 rotates. Thus, since it is not necessary to change the shape of the salient pole 31 in order to fix the insertion member 4 to the groove portion 32, the sectional area of the salient pole 31 is not reduced, and the generated torque is not reduced. Moreover, since it is not necessary to change the shape of the salient pole 31, it is possible to modify the SR motor 1 according to this embodiment by using the parts of the existing SR motor as they are.

  Moreover, since the side plate 5 is disposed on the side of the gap G, the air discharged outward from the gap G is guided by the side plate 5 so as to flow outward in the radial direction of the rotor 3. Thereby, since air is discharged toward the coil wound around the salient pole of the stator 2, the coil can be efficiently cooled.

  The SR motor 1 according to the above-described embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims.

  For example, the shape of the engagement convex portion 41 of the insertion member 4 and the engagement concave portion 51 of the side plate 5 may be any shapes that engage with each other, and is not limited to the shapes illustrated in FIGS. 4 and 5. is there.

1 SR motor (switched reluctance motor)
DESCRIPTION OF SYMBOLS 2 Stator 3 Rotor 31 Salient pole 32 Groove part 4 Insertion member 41 Engagement convex part 5 Side plate 5a Face part which opposes a rotor 51 Engagement recessed part 10 Casing 11 Bracket

Claims (1)

A switched reluctance motor comprising a rotor in which a plurality of salient poles are formed, and a stator that is coaxial with the rotor and disposed in contact with the outer periphery of the rotor.
An insertion member to be inserted into the groove between the salient poles;
In a state where the insertion member is inserted into the groove, on both ends in the axial direction of the rotor, the side plates are arranged coaxially with the rotor, and have a diameter larger than the stator inner diameter,
With
Engaging convex portions that protrude outward in the axial direction from the end surface in the axial direction of the rotor are formed at both ends in the axial direction of the insertion member,
An engagement concave portion that engages with the engagement convex portion is formed on a surface portion of the side plate that faces the rotor,
By engaging the engagement convex portion and the engagement concave portion, the insertion member is locked to the side plate.
A switched reluctance motor characterized by that.

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